added viewstates to Supplier and Product

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/AdoptionDetailFragment.java

@@ -33,11 +33,6 @@ public class AdoptionDetailFragment extends Fragment {
     private FragmentAdoptionDetailBinding binding;
     private AdoptionDetailViewModel viewModel;
 
-    private long preselectedPetId = -1;
-    private long preselectedCustomerId = -1;
-    private long preselectedStoreId = -1;
-    private long preselectedEmployeeId = -1;
-
     private final String[] STATUSES = {"Pending", "Completed", "Cancelled"};
 
     @Override
@@ -59,7 +54,7 @@ public class AdoptionDetailFragment extends Fragment {
         setupSpinners();
         setupDatePicker();
         observeViewModel();
-        loadSpinnersData();
+        viewModel.loadInitialFormData();
         handleArguments();
 
         binding.btnAdoptionBack.setOnClickListener(v -> navigateBack());
@@ -68,14 +63,39 @@ public class AdoptionDetailFragment extends Fragment {
     }
 
     private void observeViewModel() {
-        viewModel.getPetList().observe(getViewLifecycleOwner(), list -> refreshPetSpinner());
-        viewModel.getCustomerList().observe(getViewLifecycleOwner(), list -> refreshCustomerSpinner());
-        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> refreshStoreSpinner());
-        viewModel.getEmployeeList().observe(getViewLifecycleOwner(), list -> refreshEmployeeSpinner());
+        viewModel.getViewState().observe(getViewLifecycleOwner(), this::applyViewState);
+
+        viewModel.getPetList().observe(getViewLifecycleOwner(), list -> {
+            AdoptionDetailViewModel.ViewState state = viewModel.getViewState().getValue();
+            Long petId = state != null ? state.selectedPetId : null;
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionPet, list,
+                    DropdownDTO::getLabel, "-- Select Pet --", petId, DropdownDTO::getId);
+        });
+
+        viewModel.getCustomerList().observe(getViewLifecycleOwner(), list -> {
+            AdoptionDetailViewModel.ViewState state = viewModel.getViewState().getValue();
+            Long customerId = state != null ? state.selectedCustomerId : null;
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionCustomer, list,
+                    DropdownDTO::getLabel, "-- Select Customer --", customerId, DropdownDTO::getId);
+        });
+
+        viewModel.getStoreList().observe(getViewLifecycleOwner(), list -> {
+            AdoptionDetailViewModel.ViewState state = viewModel.getViewState().getValue();
+            Long storeId = state != null ? state.selectedStoreId : null;
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionStore, list,
+                    DropdownDTO::getLabel, "-- Select Store --", storeId, DropdownDTO::getId);
+        });
+
+        viewModel.getEmployeeList().observe(getViewLifecycleOwner(), list -> {
+            AdoptionDetailViewModel.ViewState state = viewModel.getViewState().getValue();
+            Long employeeId = state != null ? state.selectedEmployeeId : null;
+            SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionEmployee, list,
+                    DropdownDTO::getLabel, "-- Select Staff --", employeeId, DropdownDTO::getId);
+        });
     }
 
     private void setLoading(boolean loading) {
-        if (binding != null && binding.progressBar != null) {
+        if (binding != null) {
             binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
         }
     }
@@ -94,14 +114,7 @@ public class AdoptionDetailFragment extends Fragment {
         binding.spinnerAdoptionCustomer.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
-                if (position > 0) {
-                    UIUtils.setViewsEnabled(true, binding.spinnerAdoptionPet);
-                } else {
-                    if (!viewModel.isEditing()) {
-                        binding.spinnerAdoptionPet.setSelection(0);
-                        UIUtils.setViewsEnabled(false, binding.spinnerAdoptionPet);
-                    }
-                }
+                viewModel.onCustomerSelected(position);
             }
             @Override
             public void onNothingSelected(AdapterView<?> parent) {}
@@ -110,12 +123,7 @@ public class AdoptionDetailFragment extends Fragment {
         binding.spinnerAdoptionStore.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
             @Override
             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
-                if (position > 0 && viewModel.getStoreList().getValue() != null && position <= viewModel.getStoreList().getValue().size()) {
-                    DropdownDTO selectedStore = viewModel.getStoreList().getValue().get(position - 1);
-                    loadEmployees(selectedStore.getId());
-                } else {
-                    viewModel.setEmployeeList(new ArrayList<>());
-                }
+                viewModel.onStoreSelected(position);
             }
             @Override
             public void onNothingSelected(AdapterView<?> parent) {}
@@ -126,111 +134,64 @@ public class AdoptionDetailFragment extends Fragment {
         binding.etAdoptionDate.setOnClickListener(v -> UIUtils.showDatePicker(requireContext(), binding.etAdoptionDate, null));
     }
 
-    private void loadSpinnersData() {
-        viewModel.loadPets().observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-            setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                viewModel.setPetList(resource.data);
-            }
-        });
-        viewModel.loadCustomers().observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-            setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                viewModel.setCustomerList(resource.data);
-            }
-        });
-        viewModel.loadStores().observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-            setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                viewModel.setStoreList(resource.data);
-            }
-        });
-    }
-
-    private void refreshPetSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionPet, viewModel.getPetList().getValue(),
-                DropdownDTO::getLabel, "-- Select Pet --",
-                preselectedPetId, DropdownDTO::getId);
-    }
-
-    private void refreshCustomerSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionCustomer, viewModel.getCustomerList().getValue(),
-                DropdownDTO::getLabel, "-- Select Customer --",
-                preselectedCustomerId, DropdownDTO::getId);
-    }
-
-    private void refreshStoreSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionStore, viewModel.getStoreList().getValue(),
-                DropdownDTO::getLabel, "-- Select Store --",
-                preselectedStoreId, DropdownDTO::getId);
-    }
-
-    private void loadEmployees(Long storeId) {
-        viewModel.loadEmployees(storeId).observe(getViewLifecycleOwner(), resource -> {
-            if (resource == null) return;
-            setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                viewModel.setEmployeeList(resource.data);
-            }
-        });
-    }
-
-    private void refreshEmployeeSpinner() {
-        SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionEmployee, viewModel.getEmployeeList().getValue(),
-                DropdownDTO::getLabel, "-- Select Staff --",
-                preselectedEmployeeId, DropdownDTO::getId);
-    }
-
     private void handleArguments() {
         Bundle a = getArguments();
         if (a != null && a.containsKey("adoptionId")) {
-            long adoptionId = a.getLong("adoptionId");
-            viewModel.setAdoptionId(adoptionId);
-            binding.tvAdoptionMode.setText("Edit Adoption");
-            binding.tvAdoptionId.setText(DateTimeUtils.formatId(adoptionId));
-            binding.tvAdoptionId.setVisibility(View.VISIBLE);
-            binding.btnDeleteAdoption.setVisibility(View.VISIBLE);
+            viewModel.setAdoptionId(a.getLong("adoptionId"));
             loadAdoptionData();
-        } else {
-            viewModel.setAdoptionId(-1);
-            binding.tvAdoptionMode.setText("Add Adoption");
-            binding.btnDeleteAdoption.setVisibility(View.GONE);
-            binding.tvAdoptionId.setVisibility(View.GONE);
-            UIUtils.setViewsEnabled(false, binding.spinnerAdoptionPet);
+            return;
         }
+        viewModel.setAdoptionId(-1);
     }
 
     private void loadAdoptionData() {
         viewModel.loadAdoption().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
             setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                AdoptionDTO a = resource.data;
-                preselectedPetId = a.getPetId() != null ? a.getPetId() : -1;
-                preselectedCustomerId = a.getCustomerId() != null ? a.getCustomerId() : -1;
-                preselectedStoreId = a.getSourceStoreId() != null ? a.getSourceStoreId() : -1;
-                preselectedEmployeeId = a.getEmployeeId() != null ? a.getEmployeeId() : -1;
-                
-                binding.etAdoptionDate.setText(a.getAdoptionDate());
-                binding.etAdoptionFee.setText(a.getAdoptionFee() != null ? a.getAdoptionFee().toString() : "");
-                SpinnerUtils.setSelectionByValue(binding.spinnerAdoptionStatus, a.getAdoptionStatus());
-                
-                refreshPetSpinner();
-                refreshCustomerSpinner();
-                refreshStoreSpinner();
-                
-                if (preselectedCustomerId != -1) {
-                    UIUtils.setViewsEnabled(true, binding.spinnerAdoptionPet);
-                }
-            } else if (resource.status == Resource.Status.ERROR) {
+            if (resource.status == Resource.Status.ERROR) {
                 Toast.makeText(getContext(), "Failed to load adoption: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }
 
+    private void applyViewState(AdoptionDetailViewModel.ViewState state) {
+        binding.tvAdoptionMode.setText(state.modeTitle);
+        binding.tvAdoptionId.setText(DateTimeUtils.formatId(viewModel.getAdoptionId()));
+        binding.tvAdoptionId.setVisibility(state.isAdoptionIdVisible ? View.VISIBLE : View.GONE);
+        binding.btnDeleteAdoption.setVisibility(state.isDeleteVisible ? View.VISIBLE : View.GONE);
+        binding.btnSaveAdoption.setText(state.saveButtonText);
+
+        UIUtils.setViewsEnabled(state.isPetEnabled, binding.spinnerAdoptionPet);
+        UIUtils.setViewsEnabled(state.isEmployeeEnabled, binding.spinnerAdoptionEmployee);
+
+        if (!state.adoptionDate.isEmpty()) {
+            binding.etAdoptionDate.setText(state.adoptionDate);
+        }
+        if (!state.adoptionFee.isEmpty()) {
+            binding.etAdoptionFee.setText(state.adoptionFee);
+        }
+        if (!state.adoptionStatus.isEmpty()) {
+            SpinnerUtils.setSelectionByValue(binding.spinnerAdoptionStatus, state.adoptionStatus);
+        }
+
+        // Re-populate spinners with updated preselected IDs
+        List<DropdownDTO> pets = viewModel.getPetList().getValue();
+        if (pets != null) SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionPet,
+                pets, DropdownDTO::getLabel, "-- Select Pet --", state.selectedPetId, DropdownDTO::getId);
+
+        List<DropdownDTO> customers = viewModel.getCustomerList().getValue();
+        if (customers != null) SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionCustomer,
+                customers, DropdownDTO::getLabel, "-- Select Customer --", state.selectedCustomerId, DropdownDTO::getId);
+
+        List<DropdownDTO> stores = viewModel.getStoreList().getValue();
+        if (stores != null) SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionStore,
+                stores, DropdownDTO::getLabel, "-- Select Store --", state.selectedStoreId, DropdownDTO::getId);
+
+        List<DropdownDTO> employees = viewModel.getEmployeeList().getValue();
+        if (employees != null) SpinnerUtils.populateSpinner(requireContext(), binding.spinnerAdoptionEmployee,
+                employees, DropdownDTO::getLabel, "-- Select Staff --", state.selectedEmployeeId, DropdownDTO::getId);
+    }
+
     private void saveAdoption() {
         if (!InputValidator.isSpinnerSelected(binding.spinnerAdoptionCustomer, "Customer")) return;
         if (!InputValidator.isSpinnerSelected(binding.spinnerAdoptionPet, "Pet")) return;
@@ -247,24 +208,17 @@ public class AdoptionDetailFragment extends Fragment {
         DropdownDTO customer = viewModel.getCustomerList().getValue().get(binding.spinnerAdoptionCustomer.getSelectedItemPosition() - 1);
         DropdownDTO pet      = viewModel.getPetList().getValue().get(binding.spinnerAdoptionPet.getSelectedItemPosition() - 1);
         DropdownDTO store    = viewModel.getStoreList().getValue().get(binding.spinnerAdoptionStore.getSelectedItemPosition() - 1);
-        
+
         Long employeeId = null;
-        if (binding.spinnerAdoptionEmployee.getSelectedItemPosition() > 0) {
+        if (binding.spinnerAdoptionEmployee.getSelectedItemPosition() > 0 && viewModel.getEmployeeList().getValue() != null) {
             employeeId = viewModel.getEmployeeList().getValue().get(binding.spinnerAdoptionEmployee.getSelectedItemPosition() - 1).getId();
         }
-        
-        String adoptionDate  = binding.etAdoptionDate.getText().toString().trim();
-        String status        = STATUSES[binding.spinnerAdoptionStatus.getSelectedItemPosition()];
+
+        String adoptionDate = binding.etAdoptionDate.getText().toString().trim();
+        String status       = STATUSES[binding.spinnerAdoptionStatus.getSelectedItemPosition()];
 
         AdoptionDTO dto = new AdoptionDTO(
-                pet.getId(),
-                customer.getId(),
-                employeeId,
-                store.getId(),
-                adoptionDate,
-                status,
-                fee
-        );
+                pet.getId(), customer.getId(), employeeId, store.getId(), adoptionDate, status, fee);
 
         viewModel.saveAdoption(dto).observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/ProductDetailFragment.java

@@ -110,7 +110,7 @@ public class ProductDetailFragment extends Fragment {
 
     private void observeViewModel() {
         viewModel.getCategoryList().observe(getViewLifecycleOwner(), list -> updateCategorySpinner());
-        
+
         viewModel.loadCategories().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
             setLoading(resource.status == Resource.Status.LOADING);
@@ -268,7 +268,7 @@ public class ProductDetailFragment extends Fragment {
     }
 
     private void confirmDelete() {
-        DialogUtils.showDeleteConfirmDialog(requireContext(), "Product", () -> 
+        DialogUtils.showDeleteConfirmDialog(requireContext(), "Product", () ->
                 viewModel.deleteProduct().observe(getViewLifecycleOwner(), resource -> {
                     if (resource == null) return;
                     setLoading(resource.status == Resource.Status.LOADING);

android/app/src/main/java/com/example/petstoremobile/fragments/listfragments/detailfragments/SupplierDetailFragment.java

@@ -11,11 +11,13 @@ import androidx.navigation.fragment.NavHostFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.EditText;
 import android.widget.Toast;
 
 import com.example.petstoremobile.databinding.FragmentSupplierDetailBinding;
 import com.example.petstoremobile.dtos.SupplierDTO;
 import com.example.petstoremobile.utils.ActivityLogger;
+import com.example.petstoremobile.utils.DateTimeUtils;
 import com.example.petstoremobile.utils.DialogUtils;
 import com.example.petstoremobile.utils.InputValidator;
 import com.example.petstoremobile.utils.Resource;
@@ -51,6 +53,7 @@ public class SupplierDetailFragment extends Fragment {
         super.onViewCreated(view, savedInstanceState);
 
         UIUtils.formatPhoneInput(binding.etSupPhone);
+        observeViewModel();
         handleArguments();
 
         binding.btnBack.setOnClickListener(v -> navigateBack());
@@ -58,8 +61,12 @@ public class SupplierDetailFragment extends Fragment {
         binding.btnDeleteSupplier.setOnClickListener(v -> deleteSupplier());
     }
 
+    private void observeViewModel() {
+        viewModel.getViewState().observe(getViewLifecycleOwner(), this::applyViewState);
+    }
+
     private void setLoading(boolean loading) {
-        if (binding != null && binding.progressBar != null) {
+        if (binding != null) {
             binding.progressBar.setVisibility(loading ? View.VISIBLE : View.GONE);
         }
     }
@@ -129,36 +136,50 @@ public class SupplierDetailFragment extends Fragment {
 
     private void handleArguments() {
         if (getArguments() != null && getArguments().containsKey("supId")) {
-            long supId = getArguments().getLong("supId");
-            viewModel.setSupId(supId);
-            binding.tvMode.setText("Edit Supplier");
-            binding.tvSupId.setText("ID: " + supId);
-            binding.tvSupId.setVisibility(View.VISIBLE);
-            binding.btnDeleteSupplier.setVisibility(View.VISIBLE);
+            viewModel.setSupId(getArguments().getLong("supId"));
             loadSupplierData();
-        } else {
-            viewModel.setSupId(-1);
-            binding.tvMode.setText("Add Supplier");
-            binding.tvSupId.setVisibility(View.GONE);
-            binding.btnDeleteSupplier.setVisibility(View.GONE);
-            binding.btnSaveSupplier.setText("Add");
+            return;
         }
+
+        viewModel.setSupId(-1);
     }
 
     private void loadSupplierData() {
         viewModel.loadSupplier().observe(getViewLifecycleOwner(), resource -> {
             if (resource == null) return;
             setLoading(resource.status == Resource.Status.LOADING);
-            if (resource.status == Resource.Status.SUCCESS && resource.data != null) {
-                SupplierDTO s = resource.data;
-                binding.etSupCompany.setText(s.getSupCompany());
-                binding.etSupContactFirstName.setText(s.getSupContactFirstName());
-                binding.etSupContactLastName.setText(s.getSupContactLastName());
-                binding.etSupEmail.setText(s.getSupEmail());
-                binding.etSupPhone.setText(s.getSupPhone());
-            } else if (resource.status == Resource.Status.ERROR) {
+            if (resource.status == Resource.Status.ERROR) {
                 Toast.makeText(getContext(), "Failed to load supplier: " + resource.message, Toast.LENGTH_SHORT).show();
             }
         });
     }
+
+    private void applyViewState(SupplierDetailViewModel.ViewState state) {
+        binding.tvMode.setText(state.modeTitle);
+        binding.tvSupId.setText(DateTimeUtils.formatId(viewModel.getSupId()));
+        binding.tvSupId.setVisibility(state.isSupIdVisible ? View.VISIBLE : View.GONE);
+        binding.btnDeleteSupplier.setVisibility(state.isDeleteVisible ? View.VISIBLE : View.GONE);
+        binding.btnSaveSupplier.setText(state.saveButtonText);
+
+        UIUtils.setViewsEnabled(state.isFieldsEnabled,
+                binding.etSupCompany,
+                binding.etSupContactFirstName,
+                binding.etSupContactLastName,
+                binding.etSupEmail,
+                binding.etSupPhone);
+
+        updateIfDifferent(binding.etSupCompany, state.supCompany);
+        updateIfDifferent(binding.etSupContactFirstName, state.supFirstName);
+        updateIfDifferent(binding.etSupContactLastName, state.supLastName);
+        updateIfDifferent(binding.etSupEmail, state.supEmail);
+        updateIfDifferent(binding.etSupPhone, state.supPhone);
+    }
+
+    private void updateIfDifferent(EditText field, String value) {
+        String current = field.getText() != null ? field.getText().toString() : "";
+        String next = value != null ? value : "";
+        if (!current.equals(next)) {
+            field.setText(next);
+        }
+    }
 }

android/app/src/main/java/com/example/petstoremobile/viewmodels/AdoptionDetailViewModel.java

@@ -27,12 +27,12 @@ public class AdoptionDetailViewModel extends ViewModel {
     private final StoreRepository storeRepository;
 
     private long adoptionId = -1;
-    private boolean isEditing = false;
 
     private final MutableLiveData<List<DropdownDTO>> petList = new MutableLiveData<>(new ArrayList<>());
     private final MutableLiveData<List<DropdownDTO>> customerList = new MutableLiveData<>(new ArrayList<>());
     private final MutableLiveData<List<DropdownDTO>> storeList = new MutableLiveData<>(new ArrayList<>());
     private final MutableLiveData<List<DropdownDTO>> employeeList = new MutableLiveData<>(new ArrayList<>());
+    private final MutableLiveData<ViewState> viewState = new MutableLiveData<>(new ViewState());
 
     @Inject
     public AdoptionDetailViewModel(AdoptionRepository adoptionRepository, PetRepository petRepository,
@@ -45,7 +45,7 @@ public class AdoptionDetailViewModel extends ViewModel {
 
     public void setAdoptionId(long id) {
         this.adoptionId = id;
-        this.isEditing = id != -1;
+        initMode(id != -1);
     }
 
     public long getAdoptionId() {
@@ -53,50 +53,155 @@ public class AdoptionDetailViewModel extends ViewModel {
     }
 
     public boolean isEditing() {
-        return isEditing;
+        ViewState current = viewState.getValue();
+        return current != null && current.isEditing;
+    }
+
+    public LiveData<ViewState> getViewState() {
+        return viewState;
+    }
+
+    public void initMode(boolean isEditing) {
+        updateViewState(state -> {
+            state.isEditing = isEditing;
+            state.modeTitle = isEditing ? "Edit Adoption" : "Add Adoption";
+            state.saveButtonText = isEditing ? "Save" : "Add";
+            state.isAdoptionIdVisible = isEditing;
+            state.isDeleteVisible = isEditing;
+            state.isPetEnabled = isEditing;
+            state.isEmployeeEnabled = isEditing;
+        });
+    }
+
+    public void loadInitialFormData() {
+        petRepository.getAdoptionPets().observeForever(r -> {
+            if (r != null && r.status == Resource.Status.SUCCESS && r.data != null) {
+                petList.setValue(r.data);
+            }
+        });
+        customerRepository.getCustomerDropdowns().observeForever(r -> {
+            if (r != null && r.status == Resource.Status.SUCCESS && r.data != null) {
+                customerList.setValue(r.data);
+            }
+        });
+        storeRepository.getStoreDropdowns().observeForever(r -> {
+            if (r != null && r.status == Resource.Status.SUCCESS && r.data != null) {
+                storeList.setValue(r.data);
+            }
+        });
+    }
+
+    public void onCustomerSelected(int position) {
+        List<DropdownDTO> list = customerList.getValue();
+        Long customerId = (position > 0 && list != null && position <= list.size())
+                ? list.get(position - 1).getId() : null;
+        updateViewState(state -> {
+            state.selectedCustomerId = customerId;
+            state.isPetEnabled = customerId != null;
+            if (customerId == null && !state.isEditing) {
+                state.selectedPetId = null;
+            }
+        });
+    }
+
+    public void onStoreSelected(int position) {
+        List<DropdownDTO> list = storeList.getValue();
+        if (position > 0 && list != null && position <= list.size()) {
+            Long storeId = list.get(position - 1).getId();
+            updateViewState(state -> {
+                state.selectedStoreId = storeId;
+                state.isEmployeeEnabled = true;
+            });
+            loadEmployeesForStore(storeId);
+        } else {
+            employeeList.setValue(new ArrayList<>());
+            updateViewState(state -> {
+                state.selectedStoreId = null;
+                state.selectedEmployeeId = null;
+                state.isEmployeeEnabled = false;
+            });
+        }
+    }
+
+    private void loadEmployeesForStore(Long storeId) {
+        storeRepository.getStoreEmployees(storeId).observeForever(r -> {
+            if (r != null && r.status == Resource.Status.SUCCESS && r.data != null) {
+                employeeList.setValue(r.data);
+            }
+        });
     }
 
     public LiveData<Resource<AdoptionDTO>> loadAdoption() {
-        return adoptionRepository.getAdoptionById(adoptionId);
-    }
+        MutableLiveData<Resource<AdoptionDTO>> result = new MutableLiveData<>();
+        adoptionRepository.getAdoptionById(adoptionId).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                AdoptionDTO a = resource.data;
+                updateViewState(state -> {
+                    state.selectedPetId = a.getPetId() != null ? a.getPetId() : -1;
+                    state.selectedCustomerId = a.getCustomerId() != null ? a.getCustomerId() : -1;
+                    state.selectedStoreId = a.getSourceStoreId() != null ? a.getSourceStoreId() : -1;
+                    state.selectedEmployeeId = a.getEmployeeId() != null ? a.getEmployeeId() : -1;
+                    state.adoptionDate = a.getAdoptionDate() != null ? a.getAdoptionDate() : "";
+                    state.adoptionFee = a.getAdoptionFee() != null ? a.getAdoptionFee().toString() : "";
+                    state.adoptionStatus = a.getAdoptionStatus() != null ? a.getAdoptionStatus() : "";
+                    state.isPetEnabled = state.selectedCustomerId != null && state.selectedCustomerId != -1;
+                    state.isEmployeeEnabled = state.selectedStoreId != null && state.selectedStoreId != -1;
+                });
 
-    public LiveData<Resource<List<DropdownDTO>>> loadPets() {
-        return petRepository.getAdoptionPets();
-    }
-
-    public LiveData<Resource<List<DropdownDTO>>> loadCustomers() {
-        return customerRepository.getCustomerDropdowns();
-    }
-
-    public LiveData<Resource<List<DropdownDTO>>> loadStores() {
-        return storeRepository.getStoreDropdowns();
-    }
-
-    public LiveData<Resource<List<DropdownDTO>>> loadEmployees(Long storeId) {
-        return storeRepository.getStoreEmployees(storeId);
+                if (a.getSourceStoreId() != null) {
+                    loadEmployeesForStore(a.getSourceStoreId());
+                }
+            }
+            result.setValue(resource);
+        });
+        return result;
     }
 
     public LiveData<Resource<AdoptionDTO>> saveAdoption(AdoptionDTO dto) {
-        if (isEditing) {
+        if (isEditing()) {
             return adoptionRepository.updateAdoption(adoptionId, dto);
-        } else {
-            return adoptionRepository.createAdoption(dto);
         }
+        return adoptionRepository.createAdoption(dto);
     }
 
     public LiveData<Resource<Void>> deleteAdoption() {
         return adoptionRepository.deleteAdoption(adoptionId);
     }
 
-    public void setPetList(List<DropdownDTO> list) { petList.setValue(list); }
     public LiveData<List<DropdownDTO>> getPetList() { return petList; }
-
-    public void setCustomerList(List<DropdownDTO> list) { customerList.setValue(list); }
     public LiveData<List<DropdownDTO>> getCustomerList() { return customerList; }
-
-    public void setStoreList(List<DropdownDTO> list) { storeList.setValue(list); }
     public LiveData<List<DropdownDTO>> getStoreList() { return storeList; }
-
-    public void setEmployeeList(List<DropdownDTO> list) { employeeList.setValue(list); }
     public LiveData<List<DropdownDTO>> getEmployeeList() { return employeeList; }
+
+    // Kept for backward-compatibility with any remaining direct calls
+    public void setEmployeeList(List<DropdownDTO> list) { employeeList.setValue(list); }
+
+    private void updateViewState(Action<ViewState> action) {
+        ViewState current = viewState.getValue();
+        if (current != null) {
+            action.run(current);
+            viewState.setValue(current);
+        }
+    }
+
+    private interface Action<T> {
+        void run(T target);
+    }
+
+    public static class ViewState {
+        public boolean isEditing = false;
+        public boolean isAdoptionIdVisible = false;
+        public boolean isDeleteVisible = false;
+        public boolean isPetEnabled = false;
+        public boolean isEmployeeEnabled = false;
+        public String modeTitle = "Add Adoption";
+        public String saveButtonText = "Add";
+        public Long selectedPetId = null;
+        public Long selectedCustomerId = null;
+        public Long selectedStoreId = null;
+        public Long selectedEmployeeId = null;
+        public String adoptionDate = "";
+        public String adoptionFee = "";
+        public String adoptionStatus = "";
+    }
 }

android/app/src/main/java/com/example/petstoremobile/viewmodels/ProductDetailViewModel.java

@@ -83,3 +83,4 @@ public class ProductDetailViewModel extends ViewModel {
         return categoryList;
     }
 }
+

android/app/src/main/java/com/example/petstoremobile/viewmodels/SupplierDetailViewModel.java

@@ -1,6 +1,7 @@
 package com.example.petstoremobile.viewmodels;
 
 import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.ViewModel;
 
 import com.example.petstoremobile.dtos.SupplierDTO;
@@ -14,8 +15,9 @@ import dagger.hilt.android.lifecycle.HiltViewModel;
 @HiltViewModel
 public class SupplierDetailViewModel extends ViewModel {
     private final SupplierRepository repository;
+    private final MutableLiveData<ViewState> viewState = new MutableLiveData<>(new ViewState());
+
     private long supId = -1;
-    private boolean isEditing = false;
 
     @Inject
     public SupplierDetailViewModel(SupplierRepository repository) {
@@ -24,7 +26,7 @@ public class SupplierDetailViewModel extends ViewModel {
 
     public void setSupId(long id) {
         this.supId = id;
-        this.isEditing = id != -1;
+        initMode(id != -1);
     }
 
     public long getSupId() {
@@ -32,23 +34,82 @@ public class SupplierDetailViewModel extends ViewModel {
     }
 
     public boolean isEditing() {
-        return isEditing;
+        ViewState current = viewState.getValue();
+        return current != null && current.isEditing;
+    }
+
+    public LiveData<ViewState> getViewState() {
+        return viewState;
+    }
+
+    public void initMode(boolean isEditing) {
+        updateViewState(state -> {
+            state.isEditing = isEditing;
+            state.modeTitle = isEditing ? "Edit Supplier" : "Add Supplier";
+            state.saveButtonText = isEditing ? "Save" : "Add";
+            state.isSupIdVisible = isEditing;
+            state.isDeleteVisible = isEditing;
+            state.isFieldsEnabled = true;
+        });
     }
 
     public LiveData<Resource<SupplierDTO>> loadSupplier() {
-        return repository.getSupplierById(supId);
+        MutableLiveData<Resource<SupplierDTO>> result = new MutableLiveData<>();
+        repository.getSupplierById(supId).observeForever(resource -> {
+            if (resource != null && resource.status == Resource.Status.SUCCESS && resource.data != null) {
+                SupplierDTO s = resource.data;
+                updateViewState(state -> {
+                    state.supCompany = safeText(s.getSupCompany());
+                    state.supFirstName = safeText(s.getSupContactFirstName());
+                    state.supLastName = safeText(s.getSupContactLastName());
+                    state.supEmail = safeText(s.getSupEmail());
+                    state.supPhone = safeText(s.getSupPhone());
+                });
+            }
+            result.setValue(resource);
+        });
+        return result;
     }
 
     public LiveData<Resource<SupplierDTO>> saveSupplier(SupplierDTO dto) {
-        if (isEditing) {
+        if (isEditing()) {
             dto.setSupId(supId);
             return repository.updateSupplier(supId, dto);
-        } else {
-            return repository.createSupplier(dto);
         }
+        return repository.createSupplier(dto);
     }
 
     public LiveData<Resource<Void>> deleteSupplier() {
         return repository.deleteSupplier(supId);
     }
+
+    private String safeText(String value) {
+        return value == null ? "" : value.trim();
+    }
+
+    private void updateViewState(Action<ViewState> action) {
+        ViewState current = viewState.getValue();
+        if (current != null) {
+            action.run(current);
+            viewState.setValue(current);
+        }
+    }
+
+    private interface Action<T> {
+        void run(T target);
+    }
+
+    public static class ViewState {
+        public boolean isEditing = false;
+        public boolean isDeleteVisible = false;
+        public boolean isSupIdVisible = false;
+        public boolean isFieldsEnabled = true;
+        public String modeTitle = "Add Supplier";
+        public String saveButtonText = "Add";
+        public String supCompany = "";
+        public String supFirstName = "";
+        public String supLastName = "";
+        public String supEmail = "";
+        public String supPhone = "";
+    }
 }

android/app/src/main/res/layout/fragment_adoption_detail.xml

@@ -99,6 +99,21 @@
                         android:layout_height="wrap_content"
                         android:layout_marginBottom="16dp"/>
 
+                    <!-- Store -->
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:text="Source Store"
+                        android:textColor="@color/text_dark"
+                        android:textSize="12sp"
+                        android:layout_marginBottom="4dp"/>
+
+                    <Spinner
+                        android:id="@+id/spinnerAdoptionStore"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:layout_marginBottom="16dp"/>
+
                     <!-- Employee -->
                     <TextView
                         android:layout_width="wrap_content"
@@ -114,20 +129,6 @@
                         android:layout_height="wrap_content"
                         android:layout_marginBottom="16dp"/>
 
-                    <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:text="Source Store"
-                        android:textColor="@color/text_dark"
-                        android:textSize="12sp"
-                        android:layout_marginBottom="4dp"/>
-
-                    <Spinner
-                        android:id="@+id/spinnerAdoptionStore"
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:layout_marginBottom="16dp"/>
-
                     <!-- Adoption Date -->
                     <TextView
                         android:layout_width="wrap_content"